Positronium formation in the ground and n=2 levels in an e+-H collision.

Abstract

The positronium formation processes in the ground and excited n=2 levels have been investigated in ${e}^{+}$-H atom collision using the Glauber eikonal approximation. Both the differential and total formation cross sections have been studied in the intermediate- and high-energy regime. Present eikonal results are found to differ appreciably from the corresponding first-order Born values even at very high energies. The total-cross-section results have been compared with other existing theoretical values as well as with the corresponding Born cross sections.